Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 226 insertions, 0 deletions

diff --git a/drivers/net/ethernet/freescale/fs_enet/mii-bitbang.c b/drivers/net/ethernet/freescale/fs_enet/mii-bitbang.c
new file mode 100644
index 000000000..21de56345
--- /dev/null
+++ b/drivers/net/ethernet/freescale/fs_enet/mii-bitbang.c
@@ -0,0 +1,226 @@
+/*
+ * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
+ *
+ * Copyright (c) 2003 Intracom S.A.
+ *  by Pantelis Antoniou <panto@intracom.gr>
+ *
+ * 2005 (c) MontaVista Software, Inc.
+ * Vitaly Bordug <vbordug@ru.mvista.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/mii.h>
+#include <linux/platform_device.h>
+#include <linux/mdio-bitbang.h>
+#include <linux/of_address.h>
+#include <linux/of_mdio.h>
+#include <linux/of_platform.h>
+
+#include "fs_enet.h"
+
+struct bb_info {
+	struct mdiobb_ctrl ctrl;
+	__be32 __iomem *dir;
+	__be32 __iomem *dat;
+	u32 mdio_msk;
+	u32 mdc_msk;
+};
+
+/* FIXME: If any other users of GPIO crop up, then these will have to
+ * have some sort of global synchronization to avoid races with other
+ * pins on the same port.  The ideal solution would probably be to
+ * bind the ports to a GPIO driver, and have this be a client of it.
+ */
+static inline void bb_set(u32 __iomem *p, u32 m)
+{
+	out_be32(p, in_be32(p) | m);
+}
+
+static inline void bb_clr(u32 __iomem *p, u32 m)
+{
+	out_be32(p, in_be32(p) & ~m);
+}
+
+static inline int bb_read(u32 __iomem *p, u32 m)
+{
+	return (in_be32(p) & m) != 0;
+}
+
+static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
+{
+	struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
+
+	if (dir)
+		bb_set(bitbang->dir, bitbang->mdio_msk);
+	else
+		bb_clr(bitbang->dir, bitbang->mdio_msk);
+
+	/* Read back to flush the write. */
+	in_be32(bitbang->dir);
+}
+
+static inline int mdio_read(struct mdiobb_ctrl *ctrl)
+{
+	struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
+	return bb_read(bitbang->dat, bitbang->mdio_msk);
+}
+
+static inline void mdio(struct mdiobb_ctrl *ctrl, int what)
+{
+	struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
+
+	if (what)
+		bb_set(bitbang->dat, bitbang->mdio_msk);
+	else
+		bb_clr(bitbang->dat, bitbang->mdio_msk);
+
+	/* Read back to flush the write. */
+	in_be32(bitbang->dat);
+}
+
+static inline void mdc(struct mdiobb_ctrl *ctrl, int what)
+{
+	struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
+
+	if (what)
+		bb_set(bitbang->dat, bitbang->mdc_msk);
+	else
+		bb_clr(bitbang->dat, bitbang->mdc_msk);
+
+	/* Read back to flush the write. */
+	in_be32(bitbang->dat);
+}
+
+static const struct mdiobb_ops bb_ops = {
+	.owner = THIS_MODULE,
+	.set_mdc = mdc,
+	.set_mdio_dir = mdio_dir,
+	.set_mdio_data = mdio,
+	.get_mdio_data = mdio_read,
+};
+
+static int fs_mii_bitbang_init(struct mii_bus *bus, struct device_node *np)
+{
+	struct resource res;
+	const u32 *data;
+	int mdio_pin, mdc_pin, len;
+	struct bb_info *bitbang = bus->priv;
+
+	int ret = of_address_to_resource(np, 0, &res);
+	if (ret)
+		return ret;
+
+	if (resource_size(&res) <= 13)
+		return -ENODEV;
+
+	/* This should really encode the pin number as well, but all
+	 * we get is an int, and the odds of multiple bitbang mdio buses
+	 * is low enough that it's not worth going too crazy.
+	 */
+	snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
+
+	data = of_get_property(np, "fsl,mdio-pin", &len);
+	if (!data || len != 4)
+		return -ENODEV;
+	mdio_pin = *data;
+
+	data = of_get_property(np, "fsl,mdc-pin", &len);
+	if (!data || len != 4)
+		return -ENODEV;
+	mdc_pin = *data;
+
+	bitbang->dir = ioremap(res.start, resource_size(&res));
+	if (!bitbang->dir)
+		return -ENOMEM;
+
+	bitbang->dat = bitbang->dir + 4;
+	bitbang->mdio_msk = 1 << (31 - mdio_pin);
+	bitbang->mdc_msk = 1 << (31 - mdc_pin);
+
+	return 0;
+}
+
+static int fs_enet_mdio_probe(struct platform_device *ofdev)
+{
+	struct mii_bus *new_bus;
+	struct bb_info *bitbang;
+	int ret = -ENOMEM;
+
+	bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
+	if (!bitbang)
+		goto out;
+
+	bitbang->ctrl.ops = &bb_ops;
+
+	new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
+	if (!new_bus)
+		goto out_free_priv;
+
+	new_bus->name = "CPM2 Bitbanged MII",
+
+	ret = fs_mii_bitbang_init(new_bus, ofdev->dev.of_node);
+	if (ret)
+		goto out_free_bus;
+
+	new_bus->phy_mask = ~0;
+
+	new_bus->parent = &ofdev->dev;
+	platform_set_drvdata(ofdev, new_bus);
+
+	ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
+	if (ret)
+		goto out_unmap_regs;
+
+	return 0;
+
+out_unmap_regs:
+	iounmap(bitbang->dir);
+out_free_bus:
+	free_mdio_bitbang(new_bus);
+out_free_priv:
+	kfree(bitbang);
+out:
+	return ret;
+}
+
+static int fs_enet_mdio_remove(struct platform_device *ofdev)
+{
+	struct mii_bus *bus = platform_get_drvdata(ofdev);
+	struct bb_info *bitbang = bus->priv;
+
+	mdiobus_unregister(bus);
+	free_mdio_bitbang(bus);
+	iounmap(bitbang->dir);
+	kfree(bitbang);
+
+	return 0;
+}
+
+static const struct of_device_id fs_enet_mdio_bb_match[] = {
+	{
+		.compatible = "fsl,cpm2-mdio-bitbang",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, fs_enet_mdio_bb_match);
+
+static struct platform_driver fs_enet_bb_mdio_driver = {
+	.driver = {
+		.name = "fsl-bb-mdio",
+		.of_match_table = fs_enet_mdio_bb_match,
+	},
+	.probe = fs_enet_mdio_probe,
+	.remove = fs_enet_mdio_remove,
+};
+
+module_platform_driver(fs_enet_bb_mdio_driver);
+MODULE_LICENSE("GPL");